1. It shouldn't cost that much. Take a sword and chop their head off. It's cheap and painless. :enough!:
2. I don't understand your objection to the death penalty. "God gives and takes life," well sure. But... you have killing in self defence, giving a poor man money so he can stay alive, putting a premature baby on life support, pre-emptive war etc etc.
I think you might not understand the broadness of such a statement as "only God gives and takes lives". God gave us the ability to take lives too, but only in the proper situation.
And besides, if what you say is true then how come the Old Testament had the death penalty? It seemed like a good idea to Him then huh?